found: His An epitaph, c1965:cover (John Koch)
found: Bull, S. Index to biographies of contemporary composers, 1987(Koch, John; b. 1928, USA)
found: A singer's guide to the American art song : 1870-1980, 1993:page 250 (John Koch; born March 17, 1928 in Haverhill, NH; John Koch studied at Johns Hopkins University, the Peabody Conservatory, and with Bernard Wagenaar and Peter Mennin, at the Juilliard School; in 1960 he studied with Nadia Boulanger on a Fulbright grant; Koch has written symphonies, concertos, chamber music, and a handful of attractive songs; he is also a pianist, who has both concertized and accompanied; he currently lives in Norwich, Vermont)
found: ancestry.com. April 13, 2020(John Gordon Koch; born 17 March 1928 in Haverhill, New Hampshire; died 28 May 2014 in Bradford, Vermont)
